It seems that ever since Hitlery says "It takes a villiage to raise a child," that the parents have thrown their hands in the air and said "OK!" Raise my kids. It's a mess. No doubt. Parents do need to be the primary influence here. I guess it depends all on how the information was packaged and presented to the kids at the school, i.e., if it was explained as a total health program with goals and objectives, nutrition awareness and how physical activity plays a role in staying fit. IMHO, kids are not being taught these things and PE class is a good place to start, provided they leave the class motivated and not discouraged.
Can you see where this could be headed? If they can test now for body fat what next? It's plain and simple intrusive behaviour by the government schools. This same situation has been posted concerning another school doing this in another state. It's a larger crack in the door by our government to gain access to personal information.